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J & S
Muscles (skull, facial, vertebral) & Actions
Question | Action |
---|---|
Rectus capitis posterior major | Extends & rotates head |
Rectus capitis posterior minor | Extends head |
Obliquus capitis inferior | Rotates atlas |
Obliquus capitis superior | Extends & bends head laterally |
Splenius cervicis | Unilaterally (extend & hyperextend head & neck) Bilaterally (laterally flex, rotate head & neck) |
Spinalis | Extends vertebral column |
Longissimus | Extends, rotates head, Lateral flexes, extends vertebral column, Rotates ribs for forceful inspiration |
Iliocostalis | Extension, lateral flexion of vertebral column, Rotates ribs for forceful inspiration |
Depressor anguli oris | Depresses corner of mouth |
Depressor labii inferiorus | Depresses lower lip |
Serratus posterior superior | Raises ribs for inspiration |
Serratus posterior inferior | Pulls ribs down, resists pull of diaphragm |
Occipitalis (Epicranius) | Draws back scalp, Wrinkles forehead, Raises eyebrows |
Frontalis (Epicranius) | Draws back scalp, Wrinkles forehead, Raises eyebrows |
Orbicularis oris | Closure & protrusion of lips |
Orbicularis oculi | Closes eyelids |
Platysma | Depresses & draws lower lip laterally, Tightens skin of neck, Depresses mandible |
Buccinator | Compresses cheek |
Longus capitis | Unilaterally (rotate head) Bilaterally (flex head) |
Longus colli | Flex cervical vertebrae |
Mentalis | Elevates & protrudes lower lip (pouts) |
Corrugator | Draws eyebrows toward nose |
Risorius | Retracts angle of mouth (grinning) |
Levator labii superioris | elevates upper lip “elvis” |
Levator anguli oris | Depresses angle of mouth (frowning) |
Temporomandibular Joint (TMJ) | Elevation, depression, side-side, protraction, retraction |